Doing a subset of what a market leader is doing, but worse, with no path to scale or support, isn’t going to go anywhere.
Yesterday someone vibe coded a password manager in 20 minutes and posted it here. Should anyone use it? Absolutely not. It’s a security nightmare, won’t get support, and the architecture is complete trash, requiring the use to run a local server the background that the app and browser extension talk to. Not to mention it will likely never see an update.
Successful competitors do something new. A lazy vibe coded clone doesn’t nothing new, and they don’t even do all the basics.
That's the more interesting angle here to me. Rather than building a direct competitor at 10% the cost, agent assisted tooling could make it individually profitable to target small cap, cottage industry type problems that have too much nuance for a one size product. Areas where someone already has deep business insight that provides the value proposition moreso than the labor around coding. Not competitors at 10% the cost, but filling niches that wouldn't have been profitable otherwise.
The danger is that if agents get more capable, the niche markets start to erode. If a generic solution agent can acquire domain knowledge and coordinate with customers, even these 'competitors' become risky again.